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Yes I believe actually the 1986 to 1992 Volvo 240 4 doors are all interchangeable parts but I'm not sure for 1985 and earlier models.
Call Crutchfield. They have the installation kit, diagrams and instructions.
Yes
1 to 4 , front to rear
Not 100% sure about the '87, but there is no PCV valve on the 1986 Volvo 240 2.3L. Flame trap and Oil trap, but no PCV.
No, they are not user serviceable
Dextron D/M
met poep
Yes. They are exactly the same as long as the newer wagon is also a 240 (not a 740). All 240 hoods are interchangeable from 1986 on.
On my 88 240 the wiper relay is located to the left of the clutch pedal, behind the insulation and a small metal plate - just pull the wires out from the top, and you should find the relay.
To fix the ac system on the 1988 240 Volvo, check the freon level first. Check the fuse, the relay, then the compressor clutch to find the defective part.
long answer: yes